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I'm a well-known mainframe performance guy, with almost 30 years of experience helping customers manage systems. I also dabble in lots of other technology. I've sought to widen the Performance role, incorporating aspects of infrastructural architecture.

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Four score and seven years ago (or so it seems) the Washington Systems Center published a set of mainframe Data-In-Memory studies. These were conducted by performance teams in various IBM labs and were quite instructive and inspiring. I wish I could find the form number (and a fortiori a PDF version) for this book. Anyone? Even hardcopy would be really nice. The reason I mention this is because... [More]

!Somehow I seem to have end up writing a "Memories of..." series of blog posts. That wasn't the intention but a set of threads on IBM-MAIN Listserver got me to thinking about these nice venerable technologies - VIO, Hiperbatch, Batch LSR and Pipes. By couching these posts in terms of "memories of" it sounds like they're perhaps obsolete. With the possible exception of Hiperbatch that probably... [More]

It's nice to see a flurry of activity in IBM-MAIN about Hiperbatch. And it's more for the emotional reason of reminiscence than for any stunning insights that I'm blogging about it... Back in 1988 I ran a technical project in my then customer, Lloyds Bank, to evaluate Data In Memory (DIM). It was a fun project with a wide range of workloads on multiple machines, including the then-new DB2. So we... [More]